Loudspeaker and mobile body device having loudspeaker mounted thereon

Abstract

A loudspeaker includes a frame, a diaphragm, an edge connecting portion, a magnetic circuit having a magnetic gap, and a voice coil body. The edge connecting portion connects an outer peripheral end portion of the diaphragm and the frame to each other. The diaphragm is disposed inside of the frame. The diaphragm has a planer diaphragm and a reinforcing diaphragm. Both a front surface and a rear surface of the planer diaphragm are flat. The reinforcing diaphragm includes a thick portion and a recessed portion, and is joined to the planer diaphragm. The reinforcing diaphragm is made of resin. The thick portion is formed on an outer periphery of the reinforcing diaphragm. The recessed portion is formed at a center side of the reinforcing diaphragm.

The invention claimed is: 
     
       1. A loudspeaker, comprising:
 a frame having an outer side surface and an inner side surface; 
 a diaphragm including: a planer diaphragm having a front surface that is flat and a rear surface that is flat and is disposed at a side opposite to the front surface; and a reinforcing diaphragm made of resin, connected to the planer diaphragm, and having a thick portion formed on an outer periphery of the reinforcing diaphragm and a recessed portion formed at a center side with respect to the thick portion, the diaphragm being disposed inside of the frame; 
 an edge connecting portion for connecting an outer peripheral end portion of the diaphragm and the frame to each other; 
 a magnetic circuit having a magnetic gap, disposed at a position that opposedly faces the recessed portion, the magnetic circuit being fixed to the frame; 
 a voice coil body having a first end portion and a second end portion, the first end portion being disposed inside of the magnetic gap, and the second end portion being joined to a center portion of the diaphragm; 
 a terminal fixed to the frame; and 
 a relay line which electrically connects the terminal and the voice coil to each other, 
 wherein the relay line penetrates at least the thick portion of the diaphragm. 
 
     
     
       2. The loudspeaker according to  claim 1 , wherein the relay line extends toward the terminal from a side surface of an outer peripheral portion of the diaphragm in a gap formed between the side surface of the outer peripheral portion of the diaphragm and the inner side surface of the frame. 
     
     
       3. The loudspeaker according to  claim 2 , wherein the terminal is disposed in the gap and is connected to the relay line in the gap. 
     
     
       4. A mobile body device, comprising:
 a body; 
 a driver and an amplifier which are mounted on the body; and 
 the loudspeaker according to  claim 1 , wherein 
 an output from the amplifier is supplied to the loudspeaker. 
 
     
     
       5. The mobile body device according to  claim 4 , wherein:
 the body includes: a space formed in the body; an exterior surface disposed between the space and an outside; and an interior surface disposed between the exterior surface and the space, and 
 the loudspeaker is accommodated between the interior surface and the exterior surface. 
 
     
     
       6. The mobile body device according to  claim 5 , wherein the exterior surface is a door or a roof. 
     
     
       7. A loudspeaker, comprising:
 a frame having an outer side surface and an inner side surface; 
 a diaphragm including: a planer diaphragm having a front surface that is flat and a rear surface that is flat and is disposed at a side opposite to the front surface; and a reinforcing diaphragm made of resin, connected to the planer diaphragm, and having a thick portion formed on an outer periphery of the reinforcing diaphragm and a recessed portion formed at a center side with respect to the thick portion, the diaphragm being disposed inside of the frame; 
 an edge connecting portion for connecting an outer peripheral end portion of the diaphragm and the frame to each other; 
 a magnetic circuit having a magnetic gap, disposed at a position that opposedly faces the recessed portion, the magnetic circuit being fixed to the frame; 
 a voice coil body having a first end portion and a second end portion, the first end portion being disposed inside of the magnetic gap, and the second end portion being joined to a center portion of the diaphragm; 
 a terminal fixed to the frame; and 
 a relay line which electrically connects the terminal and the voice coil to each other, 
 wherein:
 the planer diaphragm has a reinforcing material layer made of metal, the reinforcing material layer being disposed on the rear surface of the planer diaphragm, and 
 the reinforcing diaphragm has an insulating portion formed at a bottom of the recessed portion, the insulating portion being disposed between the reinforcing material layer and the relay line. 
 
 
     
     
       8. A loudspeaker, comprising:
 a frame having an outer side surface and an inner side surface; 
 a diaphragm including: a planer diaphragm having a front surface that is flat and a rear surface that is flat and is disposed at a side opposite to the front surface; and a reinforcing diaphragm made of resin, connected to the planer diaphragm, and having a thick portion formed on an outer periphery of the reinforcing diaphragm and a recessed portion formed at a center side with respect to the thick portion, the diaphragm being disposed inside of the frame; 
 an edge connecting portion for connecting an outer peripheral end portion of the diaphragm and the frame to each other; 
 a magnetic circuit having a magnetic gap, disposed at a position that opposedly faces the recessed portion, the magnetic circuit being fixed to the frame; 
 a voice coil body having a first end portion and a second end portion, the first end portion being disposed inside of the magnetic gap, and the second end portion being joined to a center portion of the diaphragm; 
 a terminal fixed to the frame; and 
 a relay line which electrically connects the terminal and the voice coil to each other, 
 wherein:
 the planer diaphragm has a reinforcing material layer made of metal, the reinforcing material layer being disposed on the rear surface of the planer diaphragm, and 
 the reinforcing diaphragm has an insulating portion formed outside the recessed portion, the insulating portion being disposed between the reinforcing material layer and the relay line.